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NJM2777

Headphone Amplifier with Electronic Volume

Japan Radio Corporation  

NJM2777

Headphone Amplifier with Electronic Volume

I GENERAL DESCRIPTION

NJM2777 is a headphone amplifier with electronic volume. It

includes widely gain adjustable volume, +20 to –80 dB, and mute

function. These are controlled by DC voltage. The NJM2777 is

suitable for headphone output on TV set.

I FEATURES

G Operating Voltage

G Electronic Volume

G Mute Function

G Bipolar

G Package Outline

I BLOCK DIAGRAM

8 to 10 V

+20dB to -80dB

DIP14, DMP14, SSOP14

CNTa CAPa

I PACKAGE OUTLINE

NJM2777D NJM2777M NJM2777V

Mute

Mute

IN a

VOL

OUTa

IN b

VOL

OUTb

Bias

Vref

I PIN FUNCTION

1

7

CNTb CAPb V+ GND

No. SYMBOL

FUNCTION

1

V+ Power Supply

No. SYMBOL

FUNCTION

8

N.C. No connecting

14

2 OUTb Bch Output

9

Vref Reference voltage stabilized

capacitor connect terminal

3 CNTb Bch Volume control voltage 10

input

INa Ach Input

4 CAPb Bch Volume control click 11 CAPa Ach Volume control click

noise absorbing capacitor

noise absorbing capacitor

connect terminal

connect terminal

5

INb Bch Input

12 CNTa Ach Volume control voltage

8

6 Mute Mute control

input

13 OUTa Ach Output

7

N.C. No connecting

14 GND Ground

–1–

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